Analysis

Lina SinjabBBC News, Istanbul

The announcement came as no surprise. The National Coalition
wants to go to Geneva, but says the outcome of any talks should be
binding. Its statement says humanitarian aid should be allowed into
Syria, the government's offensive on opposition-held areas should end,
and all political prisoners should be released.

President Assad has said he is happy to be represented at the
talks as long as there are no preconditions. And the coalition's
announcement could be seen as setting preconditions.
There is a strong sense in Syria of the need for a political
solution. For many Syrians, the Geneva talks are the only hope of an end
to their suffering.

The National Coalition and many others inside Syria want the
talks to be effective and based on the implementation of the Geneva
Communique, which requires an immediate halt to violence and the
establishment of a transitional government.

One leading opposition figure said they feared becoming like the Palestinians and spending decades in "peace negotiations".

But UN-Arab League envoy Lakhdar
Brahimi said last week that the conference would be delayed, although he
was still "striving" for a summit by the end of the year.

Future of Syria

The National Coalition reached the agreement after two days of talks in Istanbul.

A statement released by the office of Monzer Azbik, the chief
of staff to the coalition's leader, repeated the group's demand that
President Assad step down in any transitional government.

"Bashar al-Assad will have no role in the transitional period and the future of Syria,'' it said.

The coalition also outlined conditions that must be met before the talks, including a guarantee of access for relief agencies.

US Secretary of State John Kerry said the result of the vote was encouraging.

"This is a big step forward and an important one," he told reporters in Abu Dhabi.

The US, UN and Russia have been trying for months to convince
both the Syrian government and opposition to accept a political
solution to the 32-month-old conflict based on the core elements of the
final communique issued in June 2012 after a meeting of the UN-backed
Action Group for Syria in Geneva.

The so-called Geneva Communique called for an immediate
cessation of violence and the establishment of a transitional government
that could include officials serving under Mr Assad and members of the
opposition.

The government has said it will "in principle" attend the
conference. However, it has also said it will not negotiate with
"terrorists", while dismissing almost all those who oppose it as such.
It has also insisted repeatedly that any political solution will not
involve Mr Assad's departure,

More than nine million Syrians are believed to be in need of humanitarian relief

Ahmed Jarba, the head of the National Coalition, had already indicated a willingness to attend the Geneva talks.

But several of the major rebel fighting groups have refused to recognise its authority and rejected the idea of negotiations.

More than 100,000 people have been killed since the uprising against President Assad began in March 2011, according to the UN.